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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fb7d16310768feab6cb293b1938c3de6e6e6af056bbad8ec50d7686a1ace90' 
  AND token = '1Wlehjs0t3QrIOqskjMcBJKBwcY6YD/V1DD7Db8EsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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