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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad05b901fc650ffefe1b5153f0160985d7d0f868901ba8c91e74a5e154df005' 
  AND token = '2Pbj49aatk00BvG97pQorZ0m3hYMfa2ccW827GK5Upw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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