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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ddccaf9ab1d761ec9810508d5947d785415bb47261ee557ebb9bb8a6444b1d' 
  AND token = '7f7JYqeyVujzzc6veKxQzsAvK9mJeOUOTApBseVlp2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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