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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab63d32d5e8ee1278ffed2340b127caa4b7ed924ff80beafefefd089c5c34bec' 
  AND token = 'BdtK+OILsD3cn7ypjCZ4wpD6ZGKcsjy/gaR5l4CEd4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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