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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5924a4e619593a95ede0114abc69ef4f1d22ad19c28ac5541dc697fee7d65e45' 
  AND token = 'JbCzyZBcXCn2d9f15+CmqfqkN7ySpj05slk95fmigVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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