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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869f26d85ecd0be09f6da911ca25b4fc56f93b867775e8f2957c4fb9693a48c6' 
  AND token = 'wNk7S5J+NRmPo9KJvmUwooNH7vnsJ6wFwiq508971JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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