SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97905b0b8189106a4b8d203b67e854cd0d6e42885f3f7c772c23c14ff16116f' 
  AND token = 'Aw98AKDbDhl5RtapO16+7EDhXmSCDXrymut8AS7vWWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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