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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02e33d7bd26ee00e09d330f64df388dfca8d58f7bdb9a136a9821794ef4cf8f' 
  AND token = 'd74hS/QIQHoGbsBh23WFJU6WSsDfbI4OIFgmeXaZphU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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