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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8cd5baa34d5a46bf30640c971b5637489cb9a5d9c8c5e8219800230a91e443' 
  AND token = 'd98lOPFuvxVHcjMb6A2TcQNCIFy0m1ZcJz9a609GAcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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