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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00bf879c24b0b24c8864545045f21ad87a2f2ab806d1f64ec0e1511be30994c3' 
  AND token = 'DR97/GVvcD9hu/oeg7PC0mOcODZTUKrEH7gBt3JDUmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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