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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd108ae649b42174ea201b8f2091b454c125c3a2b8377ac38cba9cb37ca939b4b' 
  AND token = 'tHLNYdUC7FAFfuwe49c106HtQQI3V5Gkk+hhl1nS5ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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