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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23c8f2c3b3e3d6ba8bbf682cfeae839951ef8e15ffcd8fa23344e929cbec36f' 
  AND token = '9Rh2iha36JaTnXAbnhd0EU9KjHIq9SYtQru8UZZ1rBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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