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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf7b115fe7b6d57b5619c0be99e03ba9c0d8049fb41aea1900fd873253d5696' 
  AND token = 'QPIFuYxv2FkldN0kAf376fCU9rBENk98AfLZ3WFj/AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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