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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2b13a3dfbf7f1067a7375c6c85414c5731675643d3bb20bc40d55640f9d85a' 
  AND token = 'jhed4Gjn25v8+h6fyZiNiKmiegXvqAMFgS74oyAuU6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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