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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146b5b3573a0c6f12bf27c6c83dc5f0ba926a47d7cdfc53c64d869c0435052ea' 
  AND token = 'IXExnnq9zlhPXjTJduytNLkXwK4Rc7lh40O43fSl61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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