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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b090977c05266507c54f0aaa45c8a31cc2f5e51c9cb92c86e7f1ac54d74451' 
  AND token = 'AXkhDEl3rISALbeNDP7Z5Gv5hLRsSxtHDebVRzYdxAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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