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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbc04d967806d95a3756b06ea172fd7a88c2582fd5fb8788a64f7a536401660' 
  AND token = 'ss98n9qO4+YWDqGdF80lEBogez1S8D0baimwbRoisIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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