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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95067c41fa172656bbf29f2621bc59ec87b96c2aca00441496c83f515cd966bd' 
  AND token = 'vlzxydGc5Qkz6U9P8PImkRnpIRs8eL/+PsyfYG/aSls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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