SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05238aabd55522e6d3bfdcf9e39c8d3211b91f6359e07fbc2711904e75651be' 
  AND token = 'wGNbmSIgpRxzPktSwpBfzvqJDn+XV4KimuuHt7xxVUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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