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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229a3995f10854e5d24c3416d4b04b7bcd5a672c06b62c2ca8b0f538429cdb6b' 
  AND token = 'xFT5S/q+tSZM/dbFMAB6uKteYn6EHqjtI8oZz3AOiOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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