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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06bc82c5ed1799987fcab22387a271b221ee675e87f69f34c6bb8b458005e3b' 
  AND token = 'gmUg+kDbIoM9OSzdc7nKbONmvCVB8Hy/waBS/3oZchA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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