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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330574547c21fdbff2f0c15a0bd6bad2dcd93621f1848471659a602670fa9c56' 
  AND token = 'pYvbEqFTS0ipWPd1OrJzrftWUETC8DENUnXgOx6fezI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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