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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d42bbd339f3f3facc3fb2e2c248cc9578a41714d6ab2fccb11eb8c6a9510f68' 
  AND token = 'Dvqr8CCAIreuZTjr7TJUc8NVKFp5W1EzyiIxYiwreFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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