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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea6f41056a846cf31f5c29c200300804652b3ab13b04702b332d1728e38482f' 
  AND token = 'a3JWfxSh3B3jhCFvtFtCOd6DcG4lzYmxy7JlCqJ0jY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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