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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '910f59379ce6b035de378188c132e7891a44ed6f817d3daae57faed656312f8a' 
  AND token = 'yM4ulK8dTokwLDcWyTD1aS5CRtEb2hjGuFMBuOAXVbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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