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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be98794d516c634eb4e473c2bb3a392b5ed6bfe816305c9e775364e0bbd5279' 
  AND token = 'gybv1R34Too+uYVaqd1ulJIdvqjcT5B/JI+FDfwqsmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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