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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3379c56d9e485bce3aad48ea83808a79787f16d6cb2fb7a81f69ca6c83ac46c4' 
  AND token = 'YXutBYeYeHsXT1Z9gv1ZpS9SwI6RW7OycTibNMu/Y1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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