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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e75b181bc585dc42e3f00335cf0bd9ad575cad0202cbd0c998675a349c9147' 
  AND token = 'Bj6fZ1ppk07wNRsxUaG9RPuzVtgsa8t/MaVi0U0KxrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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