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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bfff67eb841c43044ca03d95231f50a300766ca3b3c2118c802b6748014b6f' 
  AND token = 'lTYNvv3PJqeTGywz4D1lfDriYurnp/nps2Z8PHBeI+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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