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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed90627ec85f8a12bc9aa8948d4eb819455817925b56c65f8904f9098c73ab59' 
  AND token = '23LGRaixJ0NpnrKfLOxSswzi5dmCo6AXtG8mQphtfug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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