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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a027e88dd293a75354353a0366759b915b1fd556ee8626d6958fb6b249048795' 
  AND token = '3BeYrDCcxv3xJoYhxxdT1lxS8RMaeKA0mTS16fJiszg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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