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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817dedb986f829dde1b6cf684aecb9d954c1bb4d8eb01fab8d17d3bf7ac0762c' 
  AND token = 'UxsF6LfTlGMGNRjgbufI9hf4yDUfMpkkyMiyeiDx47c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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