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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f1fb9c2ad22cb86af55c41ac3684d833e5d1b2606d32bfb8765d0a248430c6' 
  AND token = '/csC38ezG+GdjLQAuqckYogUEuOfu1q1QGQh5e4rNTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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