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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddf816c6f8f27644c4744f8b207a796e47b7773cbd9b0755092c918ab7eb2ed' 
  AND token = 'OnVRTP0puqHpQDbw/1aZlCoNjy7l0LexVkoOXLPiUc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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