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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20411fa9ba6bf321bb2fd50e1f75c23d6b5e9a5e1d88b235af224ff2004d6429' 
  AND token = '1SKR3oP525rhwYQHvOslXASkIN966FgfeeZ+C6NeFlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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