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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20e5169405788b7f3e6f60b2f8d426aee3dec169134288f23833852f9f55c7b' 
  AND token = 'SsfyWGZbc22+l8n9CN1Trin2NGJpLY9IW9QykghIVhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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