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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed7f2ed9fa5a68e6ceff605042540d30351faff8f169e148aa8841aa039c7f4' 
  AND token = 'sbkVkLt2hIoXSuFCnw1WuCN0/Daj5H8UuDC30XPasuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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