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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4d78ea149d53ade791005d976645f37d389e6f435444336ce92100eabdc01e' 
  AND token = 'Ra7UAKoPpPxIEz2WU/iWW9HBwJDP6fxCBG5F3jQ9xRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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