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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b6a8dee05413fadb6f02526914c3b1b13e8c055027cc3a16413a3a217105656' 
  AND token = 'ywEUZSwlrAdjCE9H5ptAxpbntjgRXO1UGtDYIs0RvC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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