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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2604dada0cc7791da09f4629673084a0bb45ca00475f073dbfa374e168a6a8b2' 
  AND token = 'wYNW+hRVis+EEWZwjDPpnjL0jzjEQx8wCzxeqctBb5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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