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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d84efe84b529c5291d720fba29f3eb69d9de00ba2b1ceb3901616061046c3e8' 
  AND token = 'Z27SN+MVfc6Kbn93TK3I3LzPrntUQOG3k3+WsORNHm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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