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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d0c1f20903bc9ef055db84176b2718a41dacacf0537eb2ed77f7b4458cceb3' 
  AND token = 'JNext+7UoEsUxw2R5a1yUNp5x5MckQvl50GcyCDxH6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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