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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4019ab293e8d7c6f09c6f75de26d39e3c40d5432e155963a76c31be373651943' 
  AND token = 'UUVUm0iGoDYLWw+deolnjv+gn47h1ihmGinanIBcFsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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