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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79466f7f57bd2f5d8645cfd7b5c8e7f4ce141341bbab09be654672e73dce488b' 
  AND token = 'z6TADvSetYseGxZaMLaKo/O4by2CL42iLzcqZHZSSpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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