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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93dce2d63199f8fced67c16d9af2ff743086293a276075ffb20117dc0579cde' 
  AND token = '4xINB9JwTzuVd6990fZAEamMMM3kqgQT/hDcVLu8Q/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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