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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ee3889f84779e2177c96cbcbd051fb66df9441ab80a9a8f4975cbba4e821d3' 
  AND token = 'Nr/7cmVerxGmIn0dzHTM9K2SEz+LlhiG5ffjpGYw74c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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