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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6795287654b4e75f5d73046a96c82ed338905017dbdae86c158e0058f542b26' 
  AND token = '/r34nZH48VGmy1oqrw491MvdjdUhrAm/EcHrHPZp+SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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