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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52270a1de086208cd3772c6e54706ee32ef4532e3d46ff67ae0f29f23682322' 
  AND token = 'Fnh6N7L82FEM1mjbOLPqKkQRt19FIj51bO7V5HMQ0r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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