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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c26a8b2732668cd9cafcd381b47bb342d47c386a9f1ec53fa077fabc9d218d' 
  AND token = 'LV9XDNl8aX7rGdVlXmjBZgH9OP8ZlYKUUbgjO/7aFfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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