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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde8407509bc7dc0003328b98a944684cff47c364176d4dfc2b78a2e7705f770' 
  AND token = '+9/nAPsKK9jRnrMv7Qor/sG+cAoNWWszlOUSMyI8eg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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