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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8d3af4a96dc7af3dc64286dae2f4544351ba8e2236fe14956e8da09a0f6800' 
  AND token = 'CADfUdHmjVicLNbGTTWVK0Lp6fM+rwranaNZBjyyMjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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