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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '294061deefede8b8fde421d2ed960bb29f5a67195c4b1196cf036fd20797500f' 
  AND token = 'x7gs3uPV27pHGu2td2eRSkHbxzt4NWEYo8QkZfUW/x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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