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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cc1ce64a8a49216aab14783eb8221ef84e1647605d0e5447b0eb10eee1d7dd' 
  AND token = 'a8l6BML0i5hErsdTRw7aovYE9EH2uV+OVQ1zPMWCih8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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