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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ba8411857c12b01be9779b4ec790e51daf1015ec2f08ae5c25ea23f77930a5' 
  AND token = '93ebZFyqMtbjP4tswSyaTJBQPYbsViPQA3sMuCVGqcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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