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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1914ba887df9c76ff871064a44d40954b6bec07904754bf9bd6d13fc24144e' 
  AND token = 'W11v0lf41mNwDfooe1orfJGqHszcp80IWQ5UqtD5p9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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