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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4b19fe456ae7f188bc17626a44d777455b3ffb5a105098ccae95800d998938' 
  AND token = 'Duu4z+s9rlRylgp9txTD4oJQ+XuQQch3mqERbISs7FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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