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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92bda0274d6528332cedd1489082ff26035ebaa4e4db6adf9d1661d0bacc2fcc' 
  AND token = 'Rk30yQJf5SUResc5J+rTiGURUoEAX5Ku5W93sd57LGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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