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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8449d812501a28655d4acd9b40654806e0172860d2cbda4fec4196ad4f04431b' 
  AND token = 'ftPrSNlJleFBLtCBGR0Tnsu6RMx9QhHbFagwKnCLcZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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