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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d77a0dc11c4e2c1897f7c3b445d7db68fdc1a3d917a389dd0fa90c5fc34213' 
  AND token = 'G+b5SeQ76tF16B/vI9MgfuhkZhcOjHofCeCPJZ/tnus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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