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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6b67cbf62a98fdee6a3a40e143c18023b5f2f4f24b0ed72fa3088066dfd1d9' 
  AND token = '0smM4DnOfjt58u89TDr5dCVOwzxEvbF2SSWWvxenjPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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