SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dd2fa4e73b6d5b361c28eab65932ba7dd88d846f5774b182fb07d0013cfdcc' 
  AND token = 'Cc27YjZd3goT/S69KD+CgzGLw4xFz7PmXRogMJsXUyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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