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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db4ccf9af0abe0970c6c6432784b7756bbc14d28f3a131157c6387b945d063c' 
  AND token = 'dTzbmZSBIn2ndBf0ENWshY+CFYiuyl07X6ngbnitjX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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