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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1207ee87aec956f3cfb83da7c340e723b58e7d94e360db679815977dc76158ac' 
  AND token = '77NJj0FxGQHZbfWuxDcB84XTDwy5e7iE52yFwR+zOkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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