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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79670394eaafd87b642aae18c5d82e9a3a1234ef95bce06edb8ee967c925daf' 
  AND token = 'WuaNNJc8fnpmkoLb3xD5xVT2IrhV+GnnFoqxD4PJ6ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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