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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03caf5a03f29056a6de880c6429fe6d5d387f1ce46857786cb02374b024a2e7' 
  AND token = '896OPvxuDbtkFoWiFSWA0/QGfwBStqLxHzkpuhqyx88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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