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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44416996a681ec7ae95764e55575d356c983acd6b9141d56f6dd8f720a321fcf' 
  AND token = 'jUj31L5IYU7YCw+JsDmoG8MxLJ5of+jtWit6ZYNRI/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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