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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72512d2f57204832a893ec6d53d3fce246d306a8c2847acc06883418bec20022' 
  AND token = 'Y6k8HlymaTtHDeP4TuaLAmC430qmz0VstdazFIjh4eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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