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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b26ab8326cc8f95bd97bf67b8bbed74db461b299357d091635c1bd5942861b3' 
  AND token = '3TUy1nUNn3MOfws82C8sUyEei7bb4RLWvO2wxEobzJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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