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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac545079951c5a77a77e4ebe7fc2a9a9ecbcb0b0fc7be82d716a78f8700a813' 
  AND token = 'j7/70AwKK12DEK3sinIaZB+/7EdH5nYzsUBNbodIScU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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