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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3bff461ba478c18644007b4816bc492ac9b396d4ba0121baccd4e377d11695' 
  AND token = 'Rknw3qxNdO2+tC9E3x9RxDc4WxmIPPaLgfEvAZUBjKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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