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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25e5ad15046fd65930907ad308ca6add35b41f12564ec90e57b471278e6b130' 
  AND token = 'sEtlfJC8A32iIV4y97GETGNldn1opqsBguLJT2p3ZCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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