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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6411869d953472568a56c68e3c677233687598702466a094add688a6342e4f0b' 
  AND token = 'iFW8WtbBgQL75Gkkv8pLP4E9onZebQ8RfqEzceV0D2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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