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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29934e44054a6c20c0488a086e0cb98ddc8a010fd52ca36b79af67f7485f9ee1' 
  AND token = 'NDB8VXC6yxv6k6NlJV2BCKDO44yZSSBpgBgH4nKDTAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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