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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc7aaf436236087942ecd223efd8f169567946b10fa3d833cd790194497c0d8' 
  AND token = 'RKuhvFiHkMQJsOTSXtmJ0iyRaF5Ewc88i5bJ5yXHqP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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