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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fc8f655a7966adb0bfcba9862a5f2056747fbf85f3f2497fd35f2d09279616' 
  AND token = 'kFSng9/Yeg7G5F/J0hnmf1NwXY57fGkXy92SG3S8rB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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