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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe505cdbc6f8c00cb9123287ff124e24fb7c89a2a5e2aad03e1b617ac2f3939' 
  AND token = 'JawOdNWhKCVuDik2/cFe/qb0IsAZcKJXsSIyEAf6D40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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