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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139be064e9a8c16121231fa2f60f0613a53d941954e6a4196a8d4ce664b05189' 
  AND token = 'hpkU85y5y0LcTUuUs5t3AQo+QLTY24dFQmInQousA1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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