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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556f6a1935e03d03704d47dc8050382423e065fcb717e6d7794594b0b84740b9' 
  AND token = '7IniEifgbqu4gTPIW5wFsg8BxBRDDTP3WyZKP6HtgfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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