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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096c9b4be41d681c8262f0b492fe858e09f8c67a26b74a1f7c77deaa3fea9cd5' 
  AND token = 'b97iRy9bhvbGyx8/OYEEwsUY/lLwBIijcTxny+viwrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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