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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a7ec348aa77005b35505b0a666d3729360c8ffd37a84166b031ea5d9fd7a36' 
  AND token = 'VSg4jPkgTTcvxDE4EEOI1wycYEjZVW5UJv+na1sjLo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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