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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d051793c3441e1f4af1fcee4a1c3895f55153349cc643a02283fe5248f7cb6' 
  AND token = 'gPSNnczfpPQ5LK0nOfHbHMYd6D1QCvLOCw8lqYWsAO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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