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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc23243a272fe03604de9fa97ea1e6fab98883edbdd9825899a8ec47f9c0f28f' 
  AND token = 'dtPe+ikPcSTCkinPnhyFU4flIDBzP7QucmDq87HWopI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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