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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3189a627616281df37cbf0158bd529e6178669bb9f5f31e6863661f3598868ef' 
  AND token = '1e0U0lIDrVmRjHLwGZ0W67Tj5lwttQSQVtl/xwpNw+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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