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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365c73cb6e890044c68e936d97a093d11d126bbd4b447c6be9db2862bd3478fb' 
  AND token = 'RhB3wd28cgvUx4zDglyZu3I9HpFe9bU5U1TzzBA5DVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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