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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd4d8866b6c451214cbbc18da4fddc474f2db2966be414f0e762b4d74716629' 
  AND token = '0jmWjqrekPnjiSl+WqAQ1H6pEVRI4BKiXN8up6PVmso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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