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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328a7257de44244f130e2218b165659f26a3099857b0be7c6d85529d83f742c3' 
  AND token = '+NY5KnyMfzhxgp2egEdMhGOo09wBynfYrDrB7ZnrHGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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