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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a8179128251083450cb1eec5271177721224ae967b73135c57cbd0f9f99c53' 
  AND token = 'e3jjKKVpEPh4NYg6zeat+dKY4fkURWHaTI+sD7pLrbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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