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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f5debf0f9ca56dcf7a59bb54d6350e44f214ca38d35570852bb6d9a6d6c018b' 
  AND token = '5fpvBX4GdOgCki0XCjWpP4IdKwzFopeQE6gx4ixsQp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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