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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '459c3b1b1e115250666b59549c01a6ad7b82f1d38fdd1f5c0d9a040178862f9a' 
  AND token = '1ahkSeEakrrytMN4QD/ny3B26QIaXhwNCYyocrUI5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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