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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391a784c937beb6d7f070a1aef9add6339e376f171e401ad46ee5d052ec69ebb' 
  AND token = '6QMMAkYDIXeAXqqTEC5vmdc11a1zGnd/cGtyaKSiLkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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