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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc83b9efde2fedc0f34d9ad839bd1db2b8bbf8339c4914631eb049d16be9ceb1' 
  AND token = 'K+JqKDspgzLwccnhFnG7XP4DxYV3fdewrq10av7W8IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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