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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8018c8c63fe2ceb075725d937b7b6e0bf618f9f2328af0b27f76fcd8308c131' 
  AND token = 'DvnHq7U1Gy/A99808/jvVN9di8QcGaPLgEw5Vo8CW/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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