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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2adbb7273751ac8f07f72deca5c3ef624d0b4dff860a9eac17376d17d5f82f' 
  AND token = '+D6bWGTU6hr1OJYKMcV6PZMsNSPtu067EthvWLW8qhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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