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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e13b5b30badc27d16c32884e0b7970c40ba792eee3b52906d44e978df51ff50' 
  AND token = 'IbBHvLv5SJK3TtPxGATSpRw3xSIk03QK73NSem/ZrAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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