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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86b3186b47a9aa81d10c40ff6fab900169a6532ca52e2ec686c8c6eae8d847a' 
  AND token = 'L9jFCTnuuZtCA1dlUkCnAZFnIU2W/yDMuphPeo6H+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}